U.S. Navy

Aircraft carriers USS John C. Stennis, front, and USS George Washington sail in formation with an escort vessel during a training exercise in waters near Guam, earlier this month.

TOKYO Its probably just a coincidence; no need to worry yet. But the U.S. has quietly assembled a powerful air, land and sea armada not far from where Japan and China are squaring off over disputed islands in the East China Sea.

Two Navy aircraft carrier battle groups and a Marine Corps air-ground task force have begun operating in the Western Pacific, within easy reach of the Senkaku Islands. Thats where Japanese and Chinese patrol boats are engaged in an increasingly tense standoff.

Chinese vessels have repeatedly entered territorial waters around the small islands in recent weeks and Coast Guard vessels from Japan and Taiwan fired water cannons at each other last week. The islands are controlled and administered by Japan, but claimed by both China and Taiwan.

No warships have been directly involved in the confrontations, so far. But China has vowed to continue sending patrol vessels into territorial waters and Japan has assembled scores of Coast Guard vessels to defend the islands.

The U.S. hasnt taken sides in the ownership dispute, and Secretary of State Hillary Clinton has called for cooler heads to prevail. Nonetheless, U.S. officials have stated clearly that the Senkakus fall under the U.S.-Japan security treaty, which would require the U.S. to come to Japans aid in case of attack.

Navy officials confirmed Sunday that the USS George Washington carrier strike group has begun operating in the East China Sea, near the disputed islands. The USS John C. Stennis group is only slightly further away in the South China Sea. Each carrier is armed with more than 80 warplanes, and strike groups typically include guided-missile cruisers and destroyers, submarines and supply ships.

In the nearby Philippine Sea, some 2,200 Marines are embarked aboard the USS Bonhomme Richard and two escorts. The Marines are equipped with amphibious assault vehicles, light armored vehicles, artillery, helicopters and Harrier fighter jets.

Carrier groups and Marine task forces often operate alone, so the convergence of the three groups in a relatively small part of the Pacific represents an unusual concentration of firepower. All three are fresh from training exercises in and around Guam. Those exercises included live-fire with missiles and joint beach landings by U.S. Marines and Japanese ground troops.

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South China Sea: U.S. Fleet Nears Disputed Islands, But What For?